干旱区生态环境知识资源中心

This paper deals with the study of various features in the interstellar environment of the Be star 6 Cephei analyzing IRAS maps and optical data. We suggest that the conspicuous, nearly circular arc on the IRAS maps is a stellar wind bubble (SWB). It has been shown that the faint HII region S 133 is probably a part of a chain of ionized arcs surrounding the older group of the Cepheus OB2 association. The relationship of 6 Cephei to a giant infrared ring (Cepheus Bubble) indicates a distance of about 800 pc and an unusually high absolute brightness of -5 mag for the star. 21 Halpha emission stars have been found in the 6 Cep area. We constructed a model for the infrared point source associated with 6 Cephei in terms of the infrared emission of the surrounding reflection nebula, and modelled the extended infrared emission of the reflection nebula adopting the dust model of Desert et al. (1990). The model resulted in a significant under-abundance of very small grains (VSG) and a normal abundance of PAH’s with respect to the big grains (BG). The model gives 0.23 M. for the dust mass of the reflection nebula which is not sufficient to account for the measured reddening of the star.